All of Barnstable County will be under a Heat Advisory today.
The National Weather Service advisory will be in effect from 10:00 a.m. until 8:00 p.m. due to the high heat and humidity.
Today's heat index could reach the hundreds.
The Massachusetts Department of Environmental Protection has issued an Air Quality Alert for ground level ozone from 11:00 a.m. until 11:00 p.m.
(Photo by ALBIN BONNARD/Hans Lucas/AFP via Getty Images)
Photo: ALBIN BONNARD / AFP / Getty Images